钢管混凝土柱承载能力的研究-结构工程专业论文.docxVIP

内蒙占科技大学硕士学位论文 摘 要 近年来，钢管混凝土在工业、民用建筑中的应用越来越广泛，国内外学者在 钢管混凝土短柱方面进行了大量的研究，提出了不同的计算公式，但这些计算公 式都比较复杂；现有的有关钢管混凝土长柱失稳的经验稳定系数的计算公式偏于 保守，在实际应用中造成了不必要的浪费。因此，本文主要从以下几个方面进行 研究： 一方面，分析整理已有的钢管混凝土短柱和中长柱的试验资料，在此基础上， 继续增大长细比，进行了6根钢管混凝土和2根空钢管的长柱试验。 另一方面，基于试验研究，采用双剪应力屈服准则，推导钢管混凝土轴压短 柱的极限承载力公式，根据钢管混凝土受力变化的特点将钢管混凝土短柱分为正 常工作阶段和极限承载阶段，并在此基础卜分析了钢管混凝土轴压中长柱稳定系 数的变化特点。 j ’ 研究表明：本文提出的钢管混凝土短柱的极限承载力公式，其训‘算结果与试 验结果比较吻合；长细比在18—40范围内的中长柱的稳定系数为一定值；钢管混 凝土柱和空钢管柱长度相同时，极限承载力较后者高出50％左右，这是由于混凝 土的灌入，避免或延缓了钢管的局部屈曲，同时也增强了构件的延性性能。因此， 这项研究对实际的工程应用具有一定的参考价值。 关键词：钢管混凝土双剪屈服准则长细比核心混凝土强度提高综合系数 中长柱 一1．  Bearing Capability Analysis of Concrete Filled Steel Tubular Columns Abstract Nowadays Concrete Filled Steel Tubular Columns are widely used in industrial civil architecture．Scholars all over the world have made many researches on short columns ofeonerete filled steel mbe and they also put forward different formulas but these formulas and calculated method are miscellaneous and inconvenience to use．The existing stabilization coefficient of the bearing eapability of slender column is conservative which resulted in much squander．Therefore，researches are made in this paper from several aspects as follows． On one hand，based on the datum of short columns and mediuln slender columns coneteete filled steel tube experiments，six concrete filled steel tubes and two hollow slender steel tubes with increased slender ratio m experimented． On the other hand，using twin shearing yield rule，through analysis of experiment result,limit-bearing eapability of short column formula is concluded．Through analysis, experiment results and the calculated results are accordant．Based on the character of concrete filled steel tube．the short columns analysis黜divided to normal work stage and limit bearing capacity stage．The stabilization coefficient variation feature of medium long column is analyzed． Researches indicated that the ultimate bearing capacity formula of concrete filled steel tube short column put forward in this paper is in consistent